Arc’teryx Therme Down Parka and Therme SV Parka: 2026 Review and Comparison

UPDATE: Arc’teryx has updated the Therme lineup for the winter 2025-2026 season. The Therme SV is not being produced, and the Therme Down Parka has returned alongside a new model, the Therme Down Jacket. This review has been updated to reflect the current lineup while preserving information on the legacy SV model for reference.

Nothing says cozy, comfortable warmth on a bitter winter day quite like a down parka. Unlike regular jackets, parkas extend well past the waist, wrapping your core in extra insulation and blocking wind where it matters most. Arc’teryx’s Therme series has long set the brand's standard for everyday winter protection and style, pairing high-loft down insulation with a waterproof Gore-Tex fabric — something few lifestyle parkas offer.

For winter 2025-2026, the Therme lineup shifts slightly. The Therme Down Parka returns as the flagship model, and Arc’teryx has added a second option: the Therme Down Jacket, a nearly identical but hip-length coat built for warmth and mobility. The former heavyweight of the line, the Therme SV Parka, is not being produced this season — but because many readers still compare current models to the SV, we’ve included a complete “Legacy SV” section below.

Bottom line

• If you want maximum coverage and weather protection, the Therme Down Parka remains the do-everything winter workhorse.
• If you prefer a slightly shorter, more agile fit with the same waterproofing and down loft, the new Therme Down Jacket is the more streamlined choice.
• And if you’re shopping the secondary market or comparing specs across generations, the Therme SV still serves as a reference for Arc’teryx’s historical warmest casual parka.

Just remember: the Therme series is built for everyday, around-town winter use, not activities requiring high output or full mobility. These jackets prioritize warmth, protection and style over breathability — exactly what most people want in sub-freezing conditions.

(Patagonia’s Stormshadow Parka remains the closest competitor.)

Note that the Arc'teryx women's equivalent is the Patera Parka. The Patera Parka more closely aligns with the Therme SV Parka than the Therme Parka. Arc'teryx also has a handy jacket-finder tool: https://arcteryx.com/us/en/shop/jacket-finder 

For what it's worth, here's how Arc'teryx compares the Therme Parka to the Therme SV Parka: https://arcteryx.com/us/en/compare/X000006696/X000006581

Also see: 

• Best Arc'teryx Jackets: https://outdoorcrunch.com/best-arcteryx-jacket/
• Best Patagonia Jackets: https://outdoorcrunch.com/best-patagonia-jackets/
• Jacket temperature ratings: https://outdoorcrunch.com/jackets/

Therme Down Parka warmth

The 2025-2026 Therme Down Parka offers meaningful upgrades over prior generations — something we noticed immediately in hand and in the field. Arc’teryx increased the down fill weight to 112 grams in a size medium, up from 94 grams in last year’s model. That’s a significant boost in loft and warmth, and welcome news given that the warmer Therme SV (and its whopping 211 grams of down fill) is not returning this winter.

We’ve spent considerable time wearing the Therme Parka through winters in the Colorado Rockies, where temperatures regularly dip into the single digits and wind can sharpen the cold into something more punishing. In these conditions, the added down insulation is noticeable. The longer parka cut, high-loft European goose down, and PrimaLoft Silver (another upgrade to this year's model) synthetic mapping keep the coat reliably warm without feeling overly bulky.

Pairing 750-fill goose down with synthetic insulation in zones that encounter moisture — shoulders, underarms, cuffs — is smart design. The Down Composite Mapping ensures the jacket retains warmth even during light perspiration. To understand fill power, the difference between down and synthetic insulation like PrimaLoft and Coreloft, and how all of it affects the warmth of a jacket, check out our detailed explanation here.

It's worth mentioning here that every Arc'teryx down garment uses down certified to the Responsible Down Standard (RDS), an independent standard that safeguards animal welfare. And Arc'teryx prefers goose down over duck down because of its higher fill power (which also makes it more expensive). 

Therme Down Jacket warmth

The new Therme Down Jacket mostly mirrors the Therme Parka’s insulation strategy, using 750-fill down and strategically placed synthetic insulation. But unlike the PrimaLoft Silver in the Parka, the Jacket features a mix of Coreloft 60 and 100. The most obvious difference in warmth, of course, is the fact that the jacket is only hip length. So while not as warm as the Parka in full winter exposure, the Therme Down Jacket still handles cold weather extremely well and works especially nicely for people who prefer a hip-length silhouette.

If you live in a dry, cold climate, the Therme Down Jacket is a compelling alternative to the Parka — warmer than most casual down jackets but more agile than a full-length winter coat.

Weather Resistance: Gore-Tex ePE Across Both Models

One of the defining features of the Therme series is its waterproof construction — something that sets these jackets apart from other Arc'teryx down options like the Cerium and Thorium. 

Both the Parka and Jacket use GORE-TEX ePE, a waterproof, windproof, PFAS-free membrane. The two-layer Gore-Tex construction is less breathable than 3L varieties, and we think that's OK for the Therme line. Why? Because the Down Parka and Down Jacket are designed for low-output, around-town wear. What's most important is that they keep you warm and dry while protecting against sleet, snow and wind. 

In addition to the two-layer Gore-Tex fabric, both Therme models are treated with FC0-DWR coatings that are PFAs-free. DWR (Durable Water Repellent) finishes are sprayed onto the surface of jackets as a final coat - think of it like a wax on your freshly cleaned car. DWR coatings - not Gore-Tex membranes - are what cause water to bead up on the outside of your garments instead of soaking into the top layer of fabric. As a result, jackets with DWR finishes dry quicker than those without them. And DWR finishes also wear off over time, which is why reapplying them whenever you notice water no longer beading on your coat's surface is a worthwhile endeavor. 

If you live in a dry climate, it's worth considering whether your warmest winter jacket needs to have a waterproof Gore-Tex fabric. For straight (non-Gore-Tex) down jacket alternatives, read our review of the Thorium as well as our comparison of the Thorium vs Cerium. We should note that former Arc'teryx jackets like the Camosun and Thorsen were comparable to the Therme Parka but have since been discontinued. We previously pitted the three against one another in this review.

Fit, Comfort & Aesthetics (Our Real-World Experience)

Arc’teryx labels the Therme fit as Regular, but in our experience — corroborated by many user reviews — the Therme runs large. After wearing it extensively, we’d say:

• It has enough room for midlayers (as any winter parka should)
• Buyers between sizes should strongly consider sizing down
• The parka and jacket must strike the right balance between layering space and maintaining its clean silhouette. Your body size and shape will ultimately be the determining factor in whether the Therme line works for you. 

Aesthetic: One of the Therme’s biggest strengths

We’ve worn the Therme Parka everywhere from ski weekends to après dinners and shopping in Aspen, and it never misses. The clean, modern lines give it a premium aesthetic that pairs as easily with jeans and boots as with nicer citywear. In neutral colors like Black or Black Sapphire, it blends into urban environments seamlessly — a signature Arc’teryx look that stays understated but elevated.

Cuffs: A standout feature

The stretch-knit cuffs, complete with an internal gasket, are one of our favorite details. They slide smoothly over the wrists, trap heat effectively, and maintain the parka’s clean external cuff design.

Hand pockets: Room for improvement

One design miss is that the hand pockets sit outside the down insulation. This keeps the parka’s silhouette clean but means your hands won’t benefit from the jacket’s full warmth when tucked into pockets.

Additional Therme Down Parka and Therme Down Jacket features

Two-way zipper

A two-way primary front zipper enables you to keep the upper half of the jacket zipped, while opening up, or unzipping, the bottom half. On longer jackets like parkas, two-way front zippers help with both breathability (i.e., heat dumping) and comfort. How comfort? Well, it's not easy to sit down in a jacket that extends to your thighs or lower. Unzipping the bottom portion of your Therme or Therme SV parka provides that additional freedom of movement to make sitting more comfortable and less restrictive. 

The two-way front zipper is standard on both the Therme Parka and Therme SV Parka. 

Pockets

Both the Therme and Therme SV have an external zippered chest pocket, an internal zippered chest pocket, and two zippered handwarmer pockets that are fleece-lined. 

StormHood

Another shared feature of the Therme Parka and Therme SV Parka: an adjustable, insulated StormHood. The single adjustment cord cinches the hood evenly around your face and does an excellent job keeping the hood in a position where it both keeps you covered and protected without getting in the way. We wrote about the Arc'teryx StormHood (and compare it to the lesser-used DropHood) here. Note that the hood is not removable on either version of the parka.   

Cuffs

Keeping with the Therme Parka and Therme SV Parka theme of warmth and comfort above all else, the sleeves on both have internal cuff gaskets to help keep in the heat. The internal cuffs also allow the Therme and Therme SV to have a clean, straight cuff that, in our opinion, adds to the classy aesthetics of these parkas. 

Side-by-side photo comparison

How to wash and care for your Arc'teryx down jacket

Down is such an incredible insulator because of the tiny pockets of air within it that trap your body's heat and thus keep you warm. But when down becomes wet it loses its insulating power and is essentially worthless. It also takes a long time to dry. All of this is to say that caring for your down garment is essential to keeping you warm and to making sure that expensive jacket performs for years and years. 

There's no need to wash your down garment until you know or see that it's dirty, and that's because things like dirt and sweat compromise the ability of your jacket's high-end fabrics to repel moisture. And like we said, moisture is bad for down. 

When it is time to wash your down jacket, here's what Arc'teryx recommend:

1. Close the main zippers but leave open pocket zippers (and make sure all those pockets are empty
2. Release the tension on any drawcords, like the one for your StormHood
3. Loosen and secure any Velcro cuffs 
4. If you have a top-loading washing machine with an agitator, toss your garment in a mesh bag to help protect it
5. Use a mild detergent without scents, dyes or fabric softener, and wash on medium heat with a permanent press or gentle setting. Add an extra rinse cycle to ensure all the detergent is washed out. This down detergent from Nu is recommended and sold by Arc'teryx.
6. If you need to refresh your jacket's DWR (durable water repellent) finish, this is the time to do it. Close all zipper, hang up your damp garment, and spray the DWR evenly and thoroughly across the outside of the coat. Arc'terx recommends this Nu Durable Water Repellent spray.
7. When finished washing, turn the jacket inside out and put it in the dryer on a low heat setting. Add two clean tennis balls or other dryer balls to help the down regain its loft. Note you may want to turn the jacket inside out again to ensure all areas of the down get completely dry.

Voilà! Your down garment is hopefully as good as new.